Abstract: An improved collagen gel soft contact lens is prepared from an aldehyde-crosslinked, lens-shaped collagen gel containing a water-soluble, aliphatic, monomeric, polyhydroxy compound, e.g., glucose.

Abstract: An encapsulated measuring apparatus including a hollow body provided with a longitudinal aperture, a measuring scale and a scanning assembly positioned within the hollow body, connecting means for attaching the scanning assembly to a mounting, and sealing means for the aperture extending from walls of the hollow body and positioned so that the surfaces of the sealing means which contact the connecting means are lower than inner surfaces of the hollow body whereby penetrating liquids flow freely from the hollow body.

Abstract: The disclosure is directed to optical fiber waveguiding structures, and techniques for fabricating the same, which are designed to have reduced modal dispersion as a result of the deliberate enhancement of mode coupling in the fibers. The mode coupling is achieved in each of the structures by means of an enveloping outer jacket, typically of plastic, which is selectively deformed so as to modify the straightness of the fiber axes in a spatially periodic manner. Several alternative techniques are presented for properly deforming the outer jacket either before or after it is combined with the fibers. Since, with these structures and techniques, the outer jacket provides the desired fiber perturbations, the fibers themselves can be fabricated using standard techniques without the need for any special procedures for modifying their parameters.